from math import trunc

list1 = [1,2,3,4,5]
for i in range(len(list1)):
    print(list1[i],end=" ")
print()
print('------------------')
for i in list1:
    print(i ,end=" ")
print()
print("----------------")

list2 =[8,9]
list1.extend(list2)
print(list1)
print(list2)
list1.insert(2,66)
print(list1)
list1.sort()#升序 从小到大
print(list1)
list1.reverse()
print(list1)
list1.sort(reverse=True)

list3 = [14,22,3,4,5]
list4 = sorted(list3)
print(list3)
print(list4)

num = list4.pop()
print(num)

dict1 = {'name':'zhangsan','age':18}
dict1['sex'] = 'male' #add
dict1['age'] = 19 #update
for key in dict1:
    print(key,end=' ')
for key,value in dict1.items():
    print(key,value)

print(dict1.keys())